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' Canepa's Car Wash 248 E Park Street, Stockton, California ' Interim Status Report on Phase H Investigation ' 1.0 Project ProJjIdenti anon .� ' This assessment has been conducted to define the lateral and vertical extent of contamination from underground fuel tanks at the Canepa's Car Wash, Park Street (Figure 1) I 2.0 Site History This site is at the corner of Park and Hunter Streets in downtown Stockton, California The site is approximately one-quarter acre in size, and has had known soil contamination since 1990 The original identified sources were underground fuel tanks when they were removed from this location The contamination is from diesel fuel and gasoline, including B, T, X, & E The tank locations are shown on Figure 2 Canepa's Car Wash sold fuel at this site for several years The property is owned by the Remo Canepa Family One 12,000 gallon unleaded gasoline tank, one 5,000 gallon leaded gasoline tank Iand one 5,000 gallon diesel fuel tank were removed in 1990 Evidence of leaks or overfilling of the tanks was apparent near all the tanks Soil samples were taken at the time of the tank removal at approximately 16 feet below the ground surface All samples had elevated levels of BTEX compounds, gasoline and diesel fuel No other work has been performed at the site The tank excavations have been back-filled and concreted to original grade. 3.0 .f o Scope Work IOn September 27 & 28, 1993, WITF, Inc , conducted three soil borings in the vicinity of the former underground fuel tanks (Figure 2) The first boring, B-1, was located at the former fuel island area The second boring, B-2, was located between the two former 5,000 gallon tanks, and the third boring, B-3, was Iocated in the center of the former 12,000 gallon tank excavation Boring B-1 was drilled to 56 feet, and laboratory samples were taken every five feet from 15 to 56 feet Borings B-2 & 3 were each drilled to 515 feet, and each was laboratory sampled every five feet from 15 to 5I 5 feet. The groundwater table was located between 50 to 52 feet in each of these borings All samples were selected for analysis by the on-site geologist, based on odor, discoloration and portable PID Ireadings as noted on the Bonng Logs (Table 1, Appendix A & C)